Use MVT in place of EVT in more X86 operation lowering functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188445 91177308-0d34-0410-b5e6-96231b3b80d8
Use MVT instead of EVT in X86ISelDAGToDAG since all the types should be legal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188446 91177308-0d34-0410-b5e6-96231b3b80d8